An HSRP group can include additional routers, which are members of the
group but that don’t take the primary roles of either active or standby states. These routers
monitor the Hello messages sent by the active and standby routers to ensure that an active
and standby router exists for the HSRP group that they belong to. They will forward data
that’s specifically addressed to their own IP addresses, but they will never forward data
addressed to the virtual router unless elected to the active or standby state. These routers
send “speak” messages based on the hello timer interval that informs other routers of their
position in an election.